HAProxy known bugs for version v3.0.20 (maintenance branch 3.0) :  42 

This version (3.0.20) is a release belonging to maintenance branch 3.0 whose latest version is 3.0.23. If your version is not the last one in the maintenance branch, you are missing fixes for known bugs, and by not updating you are needlessly taking the responsibility for the risk of unexpected service outages and exposing your web site to possible security issues.

The HAProxy development team takes a great care of maintaining stable versions so that all users can apply bug fixes without having to take the risk of upgrading to a new branch. In turn users are expected to apply the fixes when the development team estimates that they were worth being backported to stable branches.

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Other versions in the same branch

This branch contains the following releases :

DateVersionComment
2026-05-113.0.23 ⇐ last
2026-05-063.0.22 
2026-04-303.0.21 
2026-04-233.0.20 ⇐ yours
2026-03-193.0.19 
2026-03-093.0.18 
2026-02-193.0.17 
2026-02-123.0.16 
2026-01-293.0.15 
2025-12-223.0.14 
2025-12-173.0.13 
2025-10-033.0.12 
2025-06-023.0.11 
2025-04-223.0.10 
2025-03-203.0.9 
2025-01-293.0.8 
2024-12-123.0.7 
2024-11-073.0.6 
2024-09-193.0.5 
2024-09-033.0.4 
2024-07-113.0.3 
2024-06-143.0.2 
2024-06-103.0.1 
2024-05-293.0.0 

Known bugs affecting this version, and already fixed in the maintenance branch

These fixes have already been queued for a more recent 3.0 version. Some of them might have already been released in a more recent version than yours, and other ones might still be pending in the maintenance branch for a future release. The list may be empty if you're already on the latest version and no new fix was backported.

Bugs are almost always tagged with a severity (some people forget the severity tag when the bug is minor). The following severities are used :

Total known bugs in this version by category :

TotalCRITICALMAJORMEDIUMMINOR
42 0 4 13 25

Click on the subjects below to get the full description of the bug :

Merge dateSubject - Severity (minor, medium, major, critical)
2026-05-11BUG/MEDIUM: tasks: Keep the TASK_RUNNING flag until queued
2026-05-11BUG/MINOR: cfgparse-listen: do not emit extraneous line in rule order warnings
2026-05-07BUG/MEDIUM: stick-table: properly check permissions on CLI's set/clear cmd
2026-05-07BUG/MEDIUM: mux-h2: fix the detection of the ext connect support
2026-05-07Revert "BUG/MINOR: mux-h2: condition the processing of 8441 extension to global setting"
2026-05-07Revert "BUG/MEDIUM: cli: fix master CLI connection slot leak on client disconnect"
2026-05-07BUG/MEDIUM: mux-h2: Properly consume padding for DATA frames
2026-05-06BUG/MEDIUM: h1: Enforce the authority validation during H1 request parsing
2026-05-06BUG/MAJOR: http: forbid comma character in authority value
2026-05-06BUG/MINOR: tools: read_line_to_trash() handle empty files without \n
2026-05-06BUG/MEDIUM: h1_htx: Remove reverved block on error during contig chunks parsing
2026-05-06BUG/MINOR: http-fetch: Fix http_auth_bearer() when custom header is used
2026-05-06BUG/MINOR: h2: only accept :protocol with extended CONNECT
2026-05-06BUG/MINOR: mux-h2: condition the processing of 8441 extension to global setting
2026-05-06BUG/MINOR: h2: add decoding for :protocol in traces
2026-05-04BUG/MINOR: mworker/cli: check ci_insert() return value in pcli_parse_request()
2026-05-04BUG/MINOR: resolvers: Free opts on parse error in resolv_parse_do_resolve()
2026-05-04BUG/MINOR: resolvers: Free new requester on error when linking a resolution
2026-05-04BUG/MINOR: tcpcheck: Properly report error for http health-checks
2026-05-04BUG/MAJOR: mux-h2: preset MSGF_BODY_CL on H2_SF_DATA_CLEN in h2c_dec_hdrs()
2026-05-04BUG/MEDIUM: mux-h2: fix the body_len to check when parsing request trailers
2026-05-04BUG/MINOR: pattern: release the reference on failure to load from file
2026-05-04BUG/MINOR: map: do not leak a map descriptor on load error
2026-05-04BUG/MINOR: acl: fix a possible arg corruption in smp_fetch_acl_parse()
2026-05-04BUG/MEDIUM: cli: fix master CLI connection slot leak on client disconnect
2026-05-04BUG/MINOR: hpack: validate idx > 0 in hpack_valid_idx()
2026-05-04BUG/MINOR: vars: only print first invalid char in fill_desc()
2026-05-04BUG/MINOR: vars: don't store the variable twice with set-var-fmt
2026-05-04BUG/MINOR: vars: make parse_store() return error on var_set() failure
2026-04-29BUG/MINOR: http-htx: Don't normalize emtpy path for OPTIONS requests
2026-04-29BUG/MEDIUM: mux-fcgi: Properly handle full buffer for FCGI_PARAM record
2026-04-29BUG/MINOR: payload: prevent integer overflow in distcc token parsing
2026-04-29BUG/MINOR: fix various typos and spelling mistakes in user-visible messages
2026-04-29BUG/MEDIUM: tasks: Do not loop in task_schedule() if a task is running
2026-04-29BUG/MAJOR: mux-h1: Deal with true 64-bits integer to emit chunks size
2026-04-29BUG/MEDIUM: http-htx: Loop on full host value during scheme based normalization
2026-04-29BUG/MEDIUM: http-htx: Don't use data from HTX message to update authority
2026-04-29BUG/MAJOR: http-htx: Store new host in a chunk for scheme-based normalization
2026-04-29BUG/MEDIUM: mux_h1: fix stack buffer overflow in h1_append_chunk_size()
2026-04-29BUG/MINOR: peers: fix wrong flag reported twice for dump_flags
2026-04-29BUG/MINOR: peers: fix logical "and" when checking for local in PEER_APP_ST_STARTING
2026-04-29BUG/MINOR: sample: fix memory leak in check_when_cond() when ACL is not found
2026-04-29BUG/MINOR: tools: fix memory leak in indent_msg() on out of memory
2026-04-29BUG/MINOR: tools: my_memspn/my_memcspn wrong cast causing incorrect byte reading

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