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Medium, CVSS 5.3amended

vLLM: incomplete CVE-2026-22778 fix leaks PIL repr addresses via Anthropic router

CVE-2026-54236GHSA-hgg8-fqqc-vfmw

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (vllm 0.24.0), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

  • PyPI vllm

    Affected
    <= 0.23.0
    Fixed in
    0.24.0

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
5.3 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
EPSS
  • CVE-2026-54236: 0.93% estimated exploitation activity in the next 30 days; percentile 60.55 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

vLLM: incomplete CVE-2026-22778 fix leaks PIL repr addresses via the Anthropic API router Researcher: Kai Aizen — SnailSploit (@SnailSploit), Adversarial & Offensive Security Research Severity: CVSS 3.1 5.3 (Medium) AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N Target: https://github.com/vllm-project/vllm --- Summary The fix for CVE-2026-22778 / GHSA-4r2x-xpjr-7cvv (PRs #31987 and #32319) introduced sanitizemessage and applied it at four FastAPI exception-handling sites in the OpenAI router. The sanitizer strips object-repr memory addresses (<io.BytesIO object at 0x7a95e299e750 → <io.BytesIO object) before error messages reach the client, defeating the ASLR-bypass primitive that CVE-2026-22778 chained with a libopenjp2 heap overflow for RCE. The fix is incomplete: response paths added to vLLM at or after the same time as the fix continue to echo str(exc) directly to clients without sanitizemessage. The original Stage 1 primitive — sending malformed image bytes so PIL raises…

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 2 · amended ·

    Amended from ghsa record GHSA-hgg8-fqqc-vfmw

  2. Revision 1 · created ·

    Published from osv record GHSA-hgg8-fqqc-vfmw

Agent brief

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# Patch Next advisory brief: CVE-2026-54236

Advisory: vLLM: incomplete CVE-2026-22778 fix leaks PIL repr addresses via Anthropic router
IDs: CVE-2026-54236, GHSA-hgg8-fqqc-vfmw
Record: https://patchnext.com/advisories/cve-2026-54236 (revision 2, source checked 26 Oct 2026, 13:49 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 5.3)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: vllm 0.24.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI vllm: affected <= 0.23.0; fixed in 0.24.0

## Suggested inspection (read-only)
- `python -m pip show vllm`: prints the installed version. Run with the environment that serves production active.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on vllm.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-hgg8-fqqc-vfmw (OSV record GHSA-hgg8-fqqc-vfmw lists affected ranges: PyPI vllm >=0 <0.24.0 (fixed))
- Verified: https://github.com/advisories/GHSA-hgg8-fqqc-vfmw (GitHub-reviewed advisory GHSA-hgg8-fqqc-vfmw lists affected ranges: PyPI vllm >=0 <=0.23.0)

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