CVE-2006-1526: Buffer overflow in the X render (Xrender) extension in X.org X server 6.8.0 up to allows attackers to cause a

Routine

LOW 2.1DOWNGRADE

CVE-2006-1526 is a low-severity flaw (CVSS 2.1) affecting x11r6. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Buffer overflow in the X render (Xrender) extension in X.org X server 6.8.0 up to allows attackers to cause a denial of service (crash), as demonstrated by the (1) XRenderCompositeTriStrip and (2) XRenderCompositeTriFan requests in the rendertest from XCB xcb/xcb-demo, which leads to an incorrect memory allocation due to a typo in an expression that uses a "&" instead of a "*" operator. NOTE: the subject line of the original announcement used an

Why this priority

No elevated risk signals yet

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	2.1 (Low)
EPSS exploit chance	0.5% (top 55%)
CISA exploited list	No
Published	2006-05-02
Last modified	2026-06-16

Publisher (CNA): Red Hat, Inc. · Vendor: x.org

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2006-05-02 21:06 UTCPublished CVE record published
2026-06-16 22:23 UTCUpdated Record last modified

x.org x11r6 DOWNGRADE

Affected: 6.7.0 · 6.8 · 6.8.1 · 6.9

Fixed in: no fixed release known

Safe to downgrade to: a release before 6.7.0

1. Check installed version

apt-cache policy x11r6 || rpm -q x11r6 || x11r6 --version

2. No fixed release: DOWNGRADE to a release before 6.7.0 (Debian / Ubuntu)

apt-cache madison x11r6 sudo apt install x11r6=<VERSION_BEFORE_6.7.0> sudo apt-mark hold x11r6

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list x11r6 sudo dnf downgrade x11r6-<VERSION_BEFORE_6.7.0> sudo dnf versionlock add x11r6

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2006-1526?

x11r6: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2006-1526 being exploited?

CVE-2006-1526 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2006-1526 affect?

CVE-2006-1526 affects x11r6. Severity is low (CVSS 2.1). Buffer overflow in the X render (Xrender) extension in X.org X server 6.8.0 up to allows attackers to cause a denial of service (crash), as demonstrated by the (1) XRenderCompositeTriStrip and (2) XRenderCompositeTriFan requests in the rend

How urgent is CVE-2006-1526?

Priority 19/100. No elevated risk signals yet.

Related CVEs

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CVE-2004-0914 HIGH 10.0 DOWNGRADE DOWNGRADE Multiple vulnerabilities in libXpm for 6.8.1 and earlier, as used in XFree86 and other packages, include (1) m

References

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