Vulnerability in openexr (CVE-2025-64181)
Summary
Vulnerability in openexr (CVE-2025-64181). Risk of unauthorized operations or information disclosure. Exploitable via openexr_exrcheck_fuzzer. Mitigation: upgrade to 3.4.3 or later.
Original description
The description as published by the source.
Summary
While fuzzing openexr_exrcheck_fuzzer, Valgrind reports a conditional branch depending on uninitialized data inside generic_unpack. This indicates a use of uninitialized memory (CWE-457). The issue is reproducible with the current OSS-Fuzz harness and a single-file PoC.
Details
Environment:
- Tooling:
valgrind --tool=memcheck --track-origins=yes - Target:
openexr_exrcheck_fuzzer - OS: Ubuntu 20.04.6 LTS focal x86_64
- openexr version and Git-commit hash:
openexr 3.4.2 | commit fd657e8a41e157e5841c7cc2e2a5efe094b069a1 (grafted, HEAD -> main, origin/main, origin/HEAD)
Function: generic_unpack
Possible root cause (based on observed symptoms):
The unpacker is branching on bytes in a scratch buffer that were never written because the decode step didn’t fully populate it.
- The first use flagged is in
generic_unpack(). That function reads from the decompressed/expanded pixel buffer to scatter data into the framebuffer. A “conditional jump depends on uninitialised value(s)” means it’s consulting bytes in that buffer before they were written. - Valgrind says the uninitialised value “was created by a heap allocation (malloc)”, not the stack: this matches a per-tile/per-scanline decode scratch buffer allocated in
exr_decoding_run().
Valgrind Trace (top frames):
==454== Conditional jump or move depends on uninitialised value(s)
==454== at 0x4539BE: generic_unpack (in /out/openexr_exrcheck_fuzzer)
==454== by 0x44B85F: exr_decodi…
Source: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2025-64181 has been found in openexr.
Attackers can target a specific entry point like openexr_exrcheck_fuzzer over the network to misuse the product.
Risk of unauthorized operations or information disclosure.
What to do: upgrade openexr to 3.4.3 or later.
If unsure, ask your IT team or search "openexr CVE-2025-64181" on the vendor's site.
CVE-2025-64181 (openexr) — CWE-457
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Attack surface: openexr_exrcheck_fuzzer / generic_unpack
Patched: 3.4.3 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-457) exists in openexr. Attackers reach the vulnerable code path via openexr_exrcheck_fuzzer without authentication.
Check the vendor advisory for the affected versions of openexr. Attack surface: openexr_exrcheck_fuzzer / generic_unpack.
Severity: ?. Risk of unauthorized operations or information disclosure.
Update to 3.4.3.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'openexr' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r 'openexr' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
openexrを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade openexr to 3.4.3ステージング環境で 3.4.3 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
-
3Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
Fix status by distribution
Fixed packages published by each distribution for this CVE
- Debian DEBIAN-CVE-2025-64181 openexr
References
- advisory nvd.nist.gov
- package github.com
- web github.com
- web github.com
- web github.com
- web github.com
- web github.com
- web github.com