CVE-2026-4775: vLLM — HIGH

A flaw was found in the libtiff library. A remote attacker could exploit a signed integer overflow vulnerability in the putcontig8bitYCbCr44tile function by providing a specially crafted TIFF file. This flaw can lead to an out-of-bounds heap write due to incorrect memory pointer calculations,...

Full CISO analysis pending enrichment.

What systems are affected?

Package	Ecosystem	Vulnerable Range	Patched
vLLM	pip	—	No patch
83.4K 130 dependents Pushed 6d ago 31% patched ~35d to patch Full package profile →
vLLM	pip	—	No patch
83.4K 130 dependents Pushed 6d ago 31% patched ~35d to patch Full package profile →
vLLM	pip	—	No patch
83.4K 130 dependents Pushed 6d ago 31% patched ~35d to patch Full package profile →
compat-libtiff3	—	—	No patch
libtiff	—	—	No patch
libtiff-main	—	—	No patch
mingw-libtiff	—	—	No patch
rhaiis/model-opt-cuda-rhel9	—	—	No patch

How severe is it?

CVSS 3.1

7.8 / 10

EPSS

N/A

Exploitation Status

No known exploitation

Sophistication

N/A

What is the attack surface?

AV Local

AC Low

PR None

UI Required

S Unchanged

C High

I High

A High

What should I do?

No patch available

Monitor for updates. Consider compensating controls or temporary mitigations.

Which compliance frameworks are affected?

Compliance analysis pending. Sign in for full compliance mapping when available.

Frequently Asked Questions

What is CVE-2026-4775?

A flaw was found in the libtiff library. A remote attacker could exploit a signed integer overflow vulnerability in the putcontig8bitYCbCr44tile function by providing a specially crafted TIFF file. This flaw can lead to an out-of-bounds heap write due to incorrect memory pointer calculations, potentially causing a denial of service (application crash) or arbitrary code execution.

Is CVE-2026-4775 actively exploited?

No confirmed active exploitation of CVE-2026-4775 has been reported, but organizations should still patch proactively.

How to fix CVE-2026-4775?

No patch is currently available. Monitor vendor advisories for updates.

What is the CVSS score for CVE-2026-4775?

CVE-2026-4775 has a CVSS v3.1 base score of 7.8 (HIGH).

What are the technical details?

Original Advisory

A flaw was found in the libtiff library. A remote attacker could exploit a signed integer overflow vulnerability in the putcontig8bitYCbCr44tile function by providing a specially crafted TIFF file. This flaw can lead to an out-of-bounds heap write due to incorrect memory pointer calculations, potentially causing a denial of service (application crash) or arbitrary code execution.

Weaknesses (CWE)

CWE-190 Integer Overflow or Wraparound

CWE-190 — Integer Overflow or Wraparound: The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.

[Requirements] Ensure that all protocols are strictly defined, such that all out-of-bounds behavior can be identified simply, and require strict conformance to the protocol.
[Requirements] Use a language that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid. If possible, choose a language or compiler that performs automatic bounds checking.

Source: MITRE CWE corpus.