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Fencer Vulns
critical 10.0

CVE-2009-1096 json

Buffer overflow in unpack200 in Java SE Development Kit (JDK) and Java Runtime Environment (JRE) 5.0 Update 17 and earlier, and 6 Update 12…

published 2009-03-25 17 y ago modified 2026-06-16 4 mo ago also EUVD-2009-1097

cvss
10.0
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
8.2%
EPSS 8.2% chance of exploitation in 30 days, percentile 94%
public exploits
0
none known

Summary

Buffer overflow in unpack200 in Java SE Development Kit (JDK) and Java Runtime Environment (JRE) 5.0 Update 17 and earlier, and 6 Update 12 and earlier, allows remote attackers to access files or execute arbitrary code via a JAR file with crafted Pack200 headers.

Patch / fix

  • java-1.6.0-ibm network satellite 5.3 1:1.6.0.7-1jpp.3.el4
  • java-1.6.0-ibm network satellite 5.3 1:1.6.0.7-1jpp.2.el5
  • java-1.5.0-sun network satellite 5.1 1.5.0.22-1jpp.1.el4
  • java-1.6.0-openjdk RHEL 5 1:1.6.0.0-0.30.b09.el5
  • java-1.6.0-openjdk-src RHEL 5 1:1.6.0.0-0.30.b09.el5
  • java-1.6.0-openjdk-demo RHEL 5 1:1.6.0.0-0.30.b09.el5
  • java-1.6.0-openjdk-javadoc RHEL 5 1:1.6.0.0-0.30.b09.el5
  • java-1.5.0-ibm RHEL 4 EXTRAS 1:1.5.0.9-1jpp.5.el4

red hat advisories RHSA-2010:0043RHSA-2009:1662RHSA-2009:0377RHSA-2009:1038RHSA-2009:1198RHSA-2009:0394

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2009-1096 updated cvss 6.8

OpenJDK Pack200 Buffer overflow vulnerability (6792554)

  • Red Hat Desktop version 4 Extras java-1.5.0-ibm 1.5.0.9-1jpp.5.el4, java-1.6.0-ibm 1.6.0.5-1jpp.1.el4, java-1.5.0-sun 1.5.0.18-1jpp.1.el4, java-1.6.0-sun 1.6.0.13-1jpp.1.el4, java-1.5.0-ibm-src 1.5.0.9-1jpp.5.el4, java-1.6.0-ibm-src 1.6.0.5-1jpp.1.el4, +16 more
    fixed: vendor fix RHSA-2009:1038
  • Red Hat Enterprise Linux (v. 5 server) java-1.6.0-openjdk 1.6.0.0-0.30.b09.el5, java-1.6.0-openjdk-src 1.6.0.0-0.30.b09.el5, java-1.6.0-openjdk-demo 1.6.0.0-0.30.b09.el5, java-1.6.0-openjdk-javadoc 1.6.0.0-0.30.b09.el5
    fixed: vendor fix RHSA-2009:0377
  • Red Hat Enterprise Linux AS version 4 Extras java-1.5.0-ibm 1.5.0.9-1jpp.5.el4, java-1.6.0-ibm 1.6.0.5-1jpp.1.el4, java-1.5.0-sun 1.5.0.18-1jpp.1.el4, java-1.6.0-sun 1.6.0.13-1jpp.1.el4, java-1.5.0-ibm-src 1.5.0.9-1jpp.5.el4, java-1.6.0-ibm-src 1.6.0.5-1jpp.1.el4, +16 more
    fixed: vendor fix RHSA-2009:1038
  • Red Hat Enterprise Linux Desktop (v. 5 client) java-1.6.0-openjdk 1.6.0.0-0.30.b09.el5, java-1.6.0-openjdk-src 1.6.0.0-0.30.b09.el5, java-1.6.0-openjdk-demo 1.6.0.0-0.30.b09.el5, java-1.6.0-openjdk-javadoc 1.6.0.0-0.30.b09.el5
    fixed: vendor fix RHSA-2009:0377
  • Red Hat Enterprise Linux Desktop Supplementary (v. 5) java-1.5.0-ibm 1.5.0.9-1jpp.3.el5, java-1.6.0-ibm 1.6.0.5-1jpp.1.el5, java-1.5.0-sun 1.5.0.18-1jpp.1.el5, java-1.6.0-sun 1.6.0.13-1jpp.1.el5, java-1.5.0-ibm-src 1.5.0.9-1jpp.3.el5, java-1.6.0-ibm-src 1.6.0.5-1jpp.1.el5, +18 more Red Hat Enterprise Linux ES version 4 Extras java-1.5.0-ibm 1.5.0.9-1jpp.5.el4, java-1.6.0-ibm 1.6.0.5-1jpp.1.el4, java-1.5.0-sun 1.5.0.18-1jpp.1.el4, java-1.6.0-sun 1.6.0.13-1jpp.1.el4, java-1.5.0-ibm-src 1.5.0.9-1jpp.5.el4, java-1.6.0-ibm-src 1.6.0.5-1jpp.1.el4, +16 more Red Hat Enterprise Linux Server Supplementary (v. 5) java-1.5.0-ibm 1.5.0.9-1jpp.3.el5, java-1.6.0-ibm 1.6.0.5-1jpp.1.el5, java-1.5.0-sun 1.5.0.18-1jpp.1.el5, java-1.6.0-sun 1.6.0.13-1jpp.1.el5, java-1.5.0-ibm-src 1.5.0.9-1jpp.3.el5, java-1.6.0-ibm-src 1.6.0.5-1jpp.1.el5, +18 more Red Hat Enterprise Linux WS version 4 Extras java-1.5.0-ibm 1.5.0.9-1jpp.5.el4, java-1.6.0-ibm 1.6.0.5-1jpp.1.el4, java-1.5.0-sun 1.5.0.18-1jpp.1.el4, java-1.6.0-sun 1.6.0.13-1jpp.1.el4, java-1.5.0-ibm-src 1.5.0.9-1jpp.5.el4, java-1.6.0-ibm-src 1.6.0.5-1jpp.1.el4, +16 more
    fixed: vendor fix RHSA-2009:1038
  • Red Hat Satellite 5.1 (RHEL v.4 AS) java-1.5.0-sun 1.5.0.22-1jpp.1.el4
    fixed: vendor fix RHSA-2009:1662
  • Red Hat Satellite 5.3 (RHEL v.4) java-1.6.0-ibm 1.6.0.7-1jpp.3.el4 Red Hat Satellite 5.3 (RHEL v.5) java-1.6.0-ibm 1.6.0.7-1jpp.2.el5
    fixed: vendor fix RHSA-2010:0043

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

8.23% chance of exploitation in the next 30 days, higher than 94% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 2.0 10.0 AV:N/AC:L/Au:N/C:C/I:C/A:C

Classification

Weakness
  • CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.