int http_remove_header2(struct http_msg *msg, struct hdr_idx *idx, struct hdr_ctx *ctx)
{
	int cur_idx = ctx->idx;
	char *sol = ctx->line;
	struct hdr_idx_elem *hdr;
	int delta, skip_comma;

	if (!cur_idx)
		return 0;

	hdr = &idx->v[cur_idx];
	if (sol[ctx->del] == ':' && ctx->val + ctx->vlen + ctx->tws == hdr->len) {
		/* This was the only value of the header, we must now remove it entirely. */
		delta = buffer_replace2(msg->chn->buf, sol, sol + hdr->len + hdr->cr + 1, NULL, 0);
		http_msg_move_end(msg, delta);
		idx->used--;
		hdr->len = 0;   /* unused entry */
		idx->v[ctx->prev].next = idx->v[ctx->idx].next;
		if (idx->tail == ctx->idx)
			idx->tail = ctx->prev;
		ctx->idx = ctx->prev;    /* walk back to the end of previous header */
		ctx->line -= idx->v[ctx->idx].len + idx->v[cur_idx].cr + 1;
		ctx->val = idx->v[ctx->idx].len; /* point to end of previous header */
		ctx->tws = ctx->vlen = 0;
		return ctx->idx;
	}

	/* This was not the only value of this header. We have to remove between
	 * ctx->del+1 and ctx->val+ctx->vlen+ctx->tws+1 included. If it is the
	 * last entry of the list, we remove the last separator.
	 */

	skip_comma = (ctx->val + ctx->vlen + ctx->tws == hdr->len) ? 0 : 1;
	delta = buffer_replace2(msg->chn->buf, sol + ctx->del + skip_comma,
				sol + ctx->val + ctx->vlen + ctx->tws + skip_comma,
				NULL, 0);
	hdr->len += delta;
	http_msg_move_end(msg, delta);
	ctx->val = ctx->del;
	ctx->tws = ctx->vlen = 0;
	return ctx->idx;
}

This weakness involves numeric computation errors, such as integer overflows, underflows, or precision losses, which can lead to miscalculations and exploitable behaviors in software.