# CVE-2025-0838: libabsl20230802: There exists a heap buffer overflow vulnerable in Abseil-cpp

CVE-2025-0838 is fixed in 9 products on 1 platform, first by libabsl20210324 0~20210324.2-2ubuntu0.2, released February 21, 2025. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2025-0838
- Priority: High
- CVSS: 9.8 (Medium)
- EPSS: 0.0063
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Feb 21, 2025

## Description

There exists a heap buffer overflow vulnerable in Abseil-cpp. The sizedconstructors, reserve(), and rehash() methods ofabsl::{flat,node}hash{set,map} did not impose an upper bound on their sizeargument. As a result, it was possible for a caller to pass a very largesize that would cause an integer overflow when computing the size of thecontainer's backing store, and a subsequent out-of-bounds memory write.Subsequent accesses to the container might also access out-of-boundsmemory. We recommend upgrading past commit5a0e2cb5e3958dd90bb8569a2766622cb74d90c1

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | abseil Debian 11.6 (bullseye) | 0~20200923.3-2+deb11u1 | [DLA-4116-1](https://patchblox.com/security/data/fix/linux/dla-4116-1.md) | Apr 5, 2025 |
| Linux | abseil Debian 12.15 (bookworm) | 20220623.1-1+deb12u1 | [DEBIAN-CVE-2025-0838](https://patchblox.com/security/data/fix/linux/debian-cve-2025-0838.md) | Feb 21, 2025 |
| Linux | abseil Debian 13.5 (trixie) | 20240722.0-3 | [DEBIAN-CVE-2025-0838](https://patchblox.com/security/data/fix/linux/debian-cve-2025-0838.md) | Feb 21, 2025 |
| Linux | abseil Debian 14 | 20240722.0-3 | [DEBIAN-CVE-2025-0838](https://patchblox.com/security/data/fix/linux/debian-cve-2025-0838.md) | Feb 21, 2025 |
| Linux | abseil-cpp amzn 2023 | 20220623.1-4.amzn2023.0.2 | [ALAS2023-2025-1042](https://patchblox.com/security/data/fix/linux/alas2023-2025-1042.md) | Jun 18, 2025 |
| Linux | abseil-cpp opensuse-leap 15.6 | 20240116.3-150600.19.6.1 | [SUSE-SU-2026:0338-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-0338-1.md) | Jan 29, 2026 |
| Linux | abseil-cpp sles 15.7 | 20240116.3-150600.19.6.1 | [SUSE-SU-2026:0338-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-0338-1.md) | Jan 29, 2026 |
| Linux | abseil-cpp-debuginfo amzn 2023 | 20220623.1-4.amzn2023.0.2 | [ALAS2023-2025-1042](https://patchblox.com/security/data/fix/linux/alas2023-2025-1042.md) | Jun 18, 2025 |
| Linux | abseil-cpp-debugsource amzn 2023 | 20220623.1-4.amzn2023.0.2 | [ALAS2023-2025-1042](https://patchblox.com/security/data/fix/linux/alas2023-2025-1042.md) | Jun 18, 2025 |
| Linux | abseil-cpp-devel amzn 2023 | 20220623.1-4.amzn2023.0.2 | [ALAS2023-2025-1042](https://patchblox.com/security/data/fix/linux/alas2023-2025-1042.md) | Jun 18, 2025 |
| Linux | libabsl20210324 Ubuntu 22.04.1 LTS (jammy) | 0~20210324.2-2ubuntu0.2 | [libabsl20210324 0~20210324.2-2ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libabsl20210324-0-20210324.2-2ubuntu0.2.md) | Feb 21, 2025 |
| Linux | libabsl20220623t64 Ubuntu 24.04.5 LTS (noble) | 20220623.1-3.1ubuntu3.2 | [libabsl20220623t64 20220623.1-3.1ubuntu3.2](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libabsl20220623t64-20220623.1-3.1ubuntu3.2.md) | Feb 21, 2025 |
| Linux | libabsl20230802 Ubuntu 24.10 (oracular) | 20230802.1-4ubuntu1.2 | [libabsl20230802 20230802.1-4ubuntu1.2](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-libabsl20230802-20230802.1-4ubuntu1.2.md) | Jan 16, 2026 |
| Linux | libabsl20230802 Ubuntu 25.04 (plucky) | 20230802.1-4.2ubuntu0.2 | [libabsl20230802 20230802.1-4.2ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-libabsl20230802-20230802.1-4.2ubuntu0.2.md) | Jan 16, 2026 |
| Linux | libabsl20240722 Ubuntu 25.10 (questing) | 20240722.0-3ubuntu1 | [libabsl20240722 20240722.0-3ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-questing-libabsl20240722-20240722.0-3ubuntu1.md) | Feb 21, 2025 |

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Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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